详测 Generics Collections TList (2): First、Last、IndexOf、LastIndexOf

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses Generics.Collections;



procedure TForm1.Button1Click(Sender: TObject);

var

  List: TList<string>;

begin

  List := TList<string>.Create();

  List.Add('AA');

  List.Add('BB');

  List.Add('CC');

  List.Add('BB');

  List.Add('DD');



  ShowMessageFmt('First: %s', [List.First]); {First: AA}



  ShowMessageFmt('Last: %s', [List.Last]); {Last: DD}



  ShowMessageFmt('IndexOf: %d', [List.IndexOf('BB')]); {IndexOf: 1}



  ShowMessageFmt('LastIndexOf: %d', [List.LastIndexOf('BB')]); {LastIndexOf: 3}



  List.Free;

end;



end.